The braided ground between the engine and firewall of my 2000 Dakota failed last year causing a no start condition.
It looked good, but obviously wasn't. I felt the attachment point on the back of the head, and that seemed good, too.
Not sure what the problem actually was other than block not grounded to firewall.
I used a battery cable that had bolt through ends on both sides (like a ford cable to the relay).
Ironically, I had just found that cable laying in the road a few weeks before that, and it happened to be almost the exact length I needed.
Instead of fiddling with the back of the head mount, I simply attached it to the top of the compressor where the ground from the battery is.